Starting device for internal combustion engines



Nov.1 5,1932. A,'GARE. L. 1,887,902

STARTING DEVICE FOR INTERNAL COMBUSTION ENGINES Filed July 16, 1951' Ivix/QWZBP:

Patented Nov. 15, 1932 UNITED STATES- ADALBERTO GAREIILI,OF MILAN, ITALY STARTING DEVICE FQR INTERNAL COMBUSTION ENGINES Application filed July 16, 1931, Serial No. 551,260, and in Italy July 19, 1930.

This invention relates to apparatus for starting internal combustion engines and has for its object an arrangement of this type in which a transmission element interposed between the crank shaft and secondary shafts (cam shaft and magneto shaft, etc.) is used to give the starting impulse.

With this arrangement the starting is ef-v fected without addition of other parts to the motor and consequently without increasing its weight'or size and with a high ratio of transmission without introducing another gear between the starting element and the motor shaft. 7

According to this invention the idler gear of the timing gear train of the engine between the engine shaft and the secondary shafts is adapted to be operated through a ratchet or wound on and attached to a rotatable member connected with said pinion by the intermediate of a one-way clutch or coupling.

Embodiments of the present invention are illustrated by way of example on the annexed drawing in which Figure 1 is a front view o'fatwo-stroke single-cylinder engine provided with an embodiment of this invention; Y

F gure 2 is a section of the same on line 22-of Fig. 1; 4O

emtpodying a cord and drum starting device an Figure 4 is ure 3.

4 In the embodiment of Figures 1 and 2, a starting crank l is solid with a spindle 2 loose in a bearing 3 provided in the engine casing 4. The engine which is assumed by way of example to bea two-stroke single-cylinder one coma section on line 4-4 of Fig Figure 3 is a front view of a construction,

prises a crank shaft 5 driven by apiston and connecting rod (not shown) and journalled in bearings 6 and 7 of casing 4. Said crank shaft 5 has a flywheel 8 outside of said casing 4 and it carries a pinion 9 solid therewith and driving the engine distribution and engine service-devices through an idler gear 10 and a.

pinion 11 solid with a part to be driven, an ignition magneto 12 being shown 'on the drawing as an example ofsuch driven parts. Said idler gear 10 is mounted on the starting crank spindle 2 by means of an antifriction bearing 13 and is one-way connected therewith by means of a ratchet or one-way clutch exemplified as comprising ratchet teeth 14 on spindle 2 and rollers 15 located intermediate said ratchet teeth 14 and the bore of the hub of gear 10.

At the time the engine is started the drive of starting crank l and spindle 2 is imparted by ratchet clutch 14-15 to" the pinion 10 :which drives pinion 9 and crank shaft 5 for starting purposes while duringthe normal en-' gine operation the gear 10 revolves freely on spindle 2 to drive pinion- 11 and parts asso ciated therewith. v v y In the construction shown in Figures 3 and 4, the spindle 2 is provided with a driving 1 .drum'or pulley 16 on which a rope or cord 17 iswound and attached by one of its ends, and, then for starting the engine a pull is exerted on said cord 17 to drive drum 16,-spindle 2 and gear-10 and impart a starting impulse to the engine crank shaft 5. i

Conveniently the drum 16 is connected with a stationary part as the engine casing 4 by means of a return spring 18 which operates to windup again the cord 17 on said drum 16 quent starting operation.

Of course, any resilient return member may after operation, to make it ready for a subsebe used, as a resilient cord which winds on pulley or a drum'connecte'd with the said starting spindle.

I Of course, said cord 17 may be operated byv a remote actuation by leading it at any preferred location it being caused to run for such a purpose over loose pulleys not shown.

The arrangement of this invention is of large advantage particularly in connection with small engines in which a speed multiplying ratio is required intermediate the starting member, as a starting crank or pedal, and the en ine shaft, such increased ratio being secured by pinions 10 and 9 without neces- 5, sity for a separate member as the usual startin quadrant and ratchet pinion.

urther in the arrangement of this invenv tion the end of the crank shaft may be ena closed within the engine casing 4 or be availed 10 of for other urposes than engine starting.

What I c aim as my invention and desire to secure by United States Letters Patent 1s 1. In an internal combustion engine having a toothed wheel gear train for imparting rotation to secondary shafts of the engine during its operation, said gear train comprising an idler gear; a starting device comprising a starting operating .member and means or connectin in a single direction of revolution said member with said idler gear of said gear train.

2. In an internal combustion engine having a toothed wheel gear train for imparting rotation to secondary shafts of the engine during its operation, said gear train comprising an idler gear meshing with a pinion of the engine shaft with a transmission ratio higher than 1: 1; a starting device comprising a startin operating member and means for connectmg in a single direction of revolution said member with said idler gear of said gear train. v

3. In an internal combustion engine having a toothed wheel gear train for imparting rotation to secondary shafts of the engine during its operation, said gear train comprising an idler gear; a spindle, a starting operating member solid with said spindle, said idler giear being mounted for rotation on said spine and a one-way clutch operative between said sglindle and said idler gear.

4. an internal combustion engine, a toothed wheel gear train between the engine shaft and secondary shafts of the engine, said gear train comprisin an idler gear having a diameter greater t an the diameter of a pinion solid with the engine shaft; a spindle a starting oserating member solid with sai spindle,- sai rotation on said spindle and a one-way clutch operative between said spindle and said idler gear.

5. a toothed wheel gear train for imparting roing its operation, said gear train com rising an idler gear; a startin operating rum 9. flexible member mounts on said drum for revolving the drum, a resilient return member for said and a one-way clutch for connecting said drum with said idler gear of said gear train for transmission of the rotation of the drum produced by the actuation 66 on the flexible member to the idler gear.

idler gear beingmounted for tation to secondary shafts of the engine durrotation of the drum produced by the actuation on the flexible member to said idler gear. In testimony whereof I aflix my signature.

ADALBERTO GARELLI.

In an internal combustion engine having 

